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Well, the duramax just happened to work. You can try a black box PCM, but Its an early enough generation that I do not expect it to work. I wont say never for write support, but at this stage it will only be if the pcms happen to be compatible with the 0411. Register interest in this thread though.

I have a 1998 Vortec Black Box PCM here on the bench so I gave the Flash tool a test. 98-00 are same although they do have several OS. Looks to be working but seed/key issue? Here is what I got. If you'd like to add this just walk me through what is needed.

If you had a spreadsheet listing the security,read and program algorithim for most all the OSID's from 1996 up to last few years V6/V8 would that help any?
I have a file that looks really helpful,but I haven't broke thru that ah-ha moment with the adx/vdf's for it to be of any use to me yet.

I don't have a cable currently, but will look for one, unless you think a beta unit of yours will be available soon? I've been wanting to get into OBDII PCMs, but the expensive software has kept that from happening. I also haven't been able to decide on which software is the best to get...

The man who says something is impossible, is usually interrupted by the man doing it.

I've been wanting to get into OBDII PCMs, but the expensive software has kept that from happening. I also haven't been able to decide on which software is the best to get...

If your choice is between HPTuners and EFILive---I would recommend EFILive. I don't like HPTuners tune credit setup or their VIN/OS match. With HPTuners the year of the OS has to match the year of the VIN. If it doesn't you can't read or write to the ECM. So, for retrofit projects that must have the vehicles VIN---HPT is out. It also appears that you can't modify a calibration unless you license it. So, if someone wants to send you a tune to look at, you can't edit that tune unless you license it for 2 credits. I don't own HPT but, that is how I understand it.

... EFI-Live tends to have a very small list of supported applications...

Going to respectfully disagree with you on this point ... if you look at the supported controllers from the EFILive home page, it will become evident they support nearly every V8 engine platform from 1998 onward.

They do have limited support for 4 and 6 cylinder engines ... but again, no offense intended, most Hot Rod builds will use a V8 engine.

I have never worked with 4 or 6 cylinder engines, and have no plans to do so.

EFILive or Tunercat are more user friendly - as both allow users to define / create their own parameters based on individual need. EFILive does this via user defined CAX files, Tunercat allows users to modify the VDF files.

HPT does not allow for any such user input / customization.

As Jeff pointed out - EFILive affords the user the ability to make and save changes to a tune without having to license it - which allows for greater peer support among enthusiasts.

not everyone is going to be tuning a V8 though... in fact, i would almost exclusively be playing with 3100/3400/3800 powered cars. it's too bad DHP isn't still around, since that would have covered me in 90% of situations.

Looks like an 0411 PCM with this flash tool and a TunerPro XDF is all the V6 guys would need? So how many V6 0411 cars are out there?

As far as EFI Live and HP Tuner? The HP Tuner credit system just puts it into unobtainium for doing conversions, PCM swaps, OS swaps, engine swaps..VIN Changes... I can do what ever I want with EFI Live and one license. Don't even need the license to work on files and help someone collaborate.

Looks like an 0411 PCM with this flash tool and a TunerPro XDF is all the V6 guys would need?

For most custom swaps, I would agree, it's the cars that are originally V6, where tuning is needed that must stay with the original PCM, around here anyway, due to our new "E-test", that scans the PCM for the readiness of emissions monitors.

The man who says something is impossible, is usually interrupted by the man doing it.